<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>javascript</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box
    }
    body {
      font-size: 14px;
      padding: 20px;
    }
    ul li {
      line-height: 30px;
    }
  </style>
</head>
<body>
  <ul>
    <li></li>
  </ul>
</body>
<script>
  let arr = [1,2,3,4,5];
  const iter = arr[Symbol.iterator]()
  console.log(iter.next())
  console.log(iter.next())
  const obj = {
    name: 'zhangli',
    age: 20
  }
  console.dir(Object)
  const str = 'abcde'
  console.log(Object.values(str))
  for(let key in obj) {
    console.log(key)
  }
  
</script>
</html>